Over the past four years, the Walt Disney Company has been engaged in a secretive effort to redesign the Disney World experience. It’ll go like this: You buy your ticket online and plan all the details of your visit. Then you’ll get a wristband in the mail, which will be a passport to the experience that you’ve curated. Snug around your wrist, the so-called MagicBand will use radio frequency to communicate with sensors around the park, all orchestrated by software that effectively turns Disney World into a computer interface.